Permutation-lock.



T. H. HART. PERMUTATIONA LOCK. APPLICATION FILED 111.11.24, 1911.

Patented Mar. 26, 1912.

2 SHEETS-SHEET 2.

- WIT NESSES:

WASHINGTON D c THOMAS HENRY HART, OF' EVERETT, MASSACHUSETTS.

PERMUTATION-LOCK.

Specification of Letters Patent.

Patented Mar. 26, 1912.

Application filed March 24, 1911. Serial No. 616,567.

To all whom it may concern:

Be it known that I, THOMAS HENRY HART,

a subject of the King of Great Britain, and

a resident of Everett, in the county of MiddleseX and State ofMassachusetts, have invented a new and Improved Permutation- Lock, ofwhich the following is a full, clear, and exact description.

The object of the invention isto provide a new and improved permutationlock, arranged to permit theuser having the combination to readilyunlock the door on the outside without the use of a key, to prevent anunauthorized person from opening the lock, and to permit readyapplication of theddevice to door locks, as now generally use i For thepurpose mentioned, use is made of an outer hollow knob having a hubmounted to turn loosely on the spindle, a knob plate for attachment tothe door, a notched disk on the said hub engaged by a click spring onthe said knob plate, a series of tumblers, of which one is secured onthe knob hub within the hollow knob and the others are loose on thespindle, and an arm attached to the spindle and carrying a dog forengagement with the tumblers.

A practical embodiment of the invention is represented in theaccompanying drawi ings forming a part of this specification, in

which similar characters of reference indicate corresponding parts inall the views.

Figure 1 is a perspective view of the permutation lock as applied; Fig.2 is a section of the spindle, the outer knob and the permutationdevice, the inner knob and the corresponding portion of the spindlebeing shown in elevation; Fig. 3 is a cross section of the same on theline 3 3 of Fig. 2; Fig. I

4f is a rear face view of the outer section of the outer knob plate, theview illustrating the clicking device, and the spindle being shown incross section; Fig. 5 is a front elevation of the outer door knob, partof which is removed to show the permutation device; Fig. 6 is a faceview of the inner tumbler in position on .the spindle, said spindlebeing sho-wn in section; Fig. 7 is a like view of the same with thespacing washer in position; Fig. 8 is a like view of the second tumblerand the spindle in section; Fig. 9 is a like view of the third tumblerwith the spindle in section; Fig. l() is a side elevation of a set oftumblers oit' modified form as applied, one of the tumblers being shownin section; and Fig. 11 is a face view of one of the tumblers shown inFig. l0.

The spindle A operates the latch bolt B of the door lock, and the latteris mounted in the lock casing C attached'to the door D in the usualmanner. On the inner polygonal portion oi" the spindle A is secured theinner door knob E, and the outer portion A of the spindle A is madecylindrical, and on it is mounted to turn the hub F of an outer doorknob F made hollow, and preferably in two parts, soldered or otherwisefastened together, the said hollow outer door knob" F accommodating thepermutatio-n device.

The permutation device consists of a plurality of disk tumblers G, G',G2, mounted to turn loosely on the end A, and the tum bler G is fastenedby a screw I-I or other suitable means to the outer end of the knob hubF', which latter for this purpose eX- tends into the hollow, portion ofthe knob F, as plainly indicated in Fig. 2. A in I projects from theface of the tumbler G and extends through slots G3, G4 formed in thetumblers G and G2, and the said tumblers G, G and G2 are provided attheir peripheral faces with notches G5, G, G7, adapted to be engagedwhen in transverse alinement with each other by a dog .I pivoted on thefree end of an arm J and pressed by a spring J2, the arm J being securedon the outer end of the spindle portion A so as to turn with the same.The tumblers G, G', G2 are spaced from each other by washers K havinglugs K engaging a key-way A2 formed lengthwise on the cylindrical end Aof the spindle A.

On the inner end of the hub F of the outer door knob F is secured orformed a shoulder or disk L, provided in its peripheral face with spacednotches L adapted'to be engaged by lugs or teeth N formed on the freeends of a spring N secured at its middle portion to a bearing O formedon the outer section O of a knob plate, having an inner section O2, thesections O, O2 overlying one the other and being secured by screws O3 tothe door D. On the outer section O of the knob plate is formed anindicating point O1L adapted to register with a corresponding indicatingpoint F2 formed on the inner portion or shank of the knob F, the saidshank forming part of the hub F ofthe said knob. lVhen these indicatingpoints proper position to begin the manipulation of the lock, accordingto the known combination, in order to open the door. On the back of thesection O is secured a spring P bearing with its free end on a side ot'the polygonal portion of the spindle A, so as to hold the `latter andthe knob F in proper position when placing the knob F and the knob platein position on the spindle. Vhen the parts are assembled and the look isin use then the outer knob F turns loosely on the cylindrical end A ofthe spindle A and hence the latch bolt B cannot be withdrawn to open thedoor until the tumblers G, G and G2 are moved in suoli position thattheir notches G5, G, G7 are in transverse alinement with each other andare engaged by the dog J. The user of the door lock, knowing thecombination, which say is 5, 4, 2, turns the knob F until the point F2is in transverse alinement with the point O, and then the user turns theknob F in the direction of the arrow a until he counts live clicks feltby the lugs N engaging or snapping into a corresponding number ofnotches L on the disk L turning with the knob F. The operator then turnsthe knob F in the inverse direction of the arrow a until four clicks arecounted and then the knob F is turned again in the direction of thearrow a until two clicks are counted, so that now the notches G5, GG andG7 are in register with each other and with the dog J so that thelatter' drops into the said notches, and when the operator now turns theknob F in the inverse direction of the arrow a the tumbler G carries thedog J along and with it the arm J so that the spindle A is turned, asthe arm J is secured to the spindle, and consequently the latch bolt Bis withdrawn from its keeper in the door casing to permit of opening thedoor.

It is understood that the tumblers G, G and G2 have their notches G5, G6and G7 and the slots G3, G2 arranged according to the above combination,so that the operator on manipulating the knob F as described can unlockthe door; but it is evident that the said tumblers can be diiierentlyarranged for different combinations without deviating from the spirit ofmy invention, and it is also evident that other means may be employedJfor turning the tumblers G and G2 from the tumbler G on turning theknob F; for instance, as shown in Figs. 10 and l1, in which threetumblers Q, Q and Q2 are employed, of which the tumbler Q is attached tothe knob hub F and is provided on its front face with a struck-up lug Q3adapted to engage a similar lug Q2 on the rear face of the tumbler Q',and the latter is provided on its front face with a struck-up lug Q5adapted to engage a struck-up lug Q6 on the rear tace of the tumbler Q2.The tumblers Q, Q and Q2 are provided with peripheral notches Q7 for thedog J to drop in as soon as the notches Q7 are in transverse alinementwith each other opposite the dog J on turning the knob F according tothe proper combination.

It is understood that in case an unauthorized person removes the screwsO3 the knob F cannot be removed from the spindle A, as the arm Jcarrying the dog J is rigidly secured to the outer end of thecylindrical portion A of the spindle A, and consequently theunauthorized person cannot open the door. The arm J is preferablyprovided with a lug J 3 extending into the key-way A2 of the spindle A,and a nut J4 is screwed on the outer terminal of the spindle end A tohold the arm J in place on the spindle a washer being interposed betweenthe nut and the arm By providing the outer section O of the knob platewith a bearing O the knob F is limited in movement in an axial directionowing to the shoulder or disk L fitting into the said bearing betweenthe two sections O and 02 forming the knob plate. Thus it the insideknob E should be rew moved from the spindle A the latter cannot bepulled out on pulling on the knob F and hence the lock remains operativefrom the outside without the knob E.

It will be noticed that the permutation device shown and described isvery simple and durable in construction, and it can be readily attachedto spindles A of door locks as now in use.

Having thus described my invention, I claim as new and desire to secureby Letters Patent:

l. A permutation door lock, comprising a spindle, an outer hollow knobhaving a hub, a knob plate for attachment to the door, a notched disk onthe said hub, a click spring on the said knob plate and engaging thesaid notched disk, a series of tumblers, of which one is secured on thehub within the hollow knob and the others are loose on the spindle, andan arm attached to the spindie and carrying a dog for engagement withaithe tumblers.

2. A permutation door lock, comprising a spindle having a cylindricalportion, an outer hollow knob having a hub mounted to turn loosely onthe said cylindrical portion, a notched disk 0n the inner end of thesaid knob hub, a series of tumblers within the hollow knob and of whichone is secured to the outer end of the knob hub and the others aremounted to rotate loosely on the cylindrical spindle portion, an armfixed on the end of the cylindrical spindle portion and provided with aspring-pressed dog engaging the said tumblers, a click spring engagingthe said notched disk, and a knob plate for attachment to the door andhaving superimposed sections of which the outer one has a boss forengagement with the knob hub, the said click spring being attached tothe said outer section of the lmob plate.

3. A permutation door lock, comprising a spindle having a cylindricalportion, an outer hollow knob having a hub mounted to turn loosely onthe said cylindrical portion, a notched disk on the inner end of thesaid knob hub, a series of tumblers within the hollow knob and of whichone is secured to the outer end of the knob hub and the others aremounted to rotate loosely on the cylindrical spindle portion, an armfixed on the end of the cylindrical spindle portion and provided with aspring-pressed dog engaging the said tumblers,aclick spring engaging thesaid notched disk, a vknob plate for attachment to the door andhavingsuperimposed sections of which the outer one has a boss for engagementwith the knob hub, the said click spring being attached to the saidouter section of the knob-plate, and indicating means on the said outerknob plate part and the knob hub.

4. A permutation door lock, comprising a spindle having a cylindricalportion, an

outer hollow knob having a hub mounted to turn loosely on the saidcylindrical portion, a notched disk on the inner end of the said knobhub, a series of tumblers within the hollow knob and of which one issecured to the outer end of the knob hub and the others are mounted torotate loosely on the cylindrical spindle portion, an arm fixed on theend of the cylindrical spindle portion and provided with aspring-pressed dog engaging the said tumblers, a click spring engagingthe said notched disk, a knob plate for at- Gopies of this patent may beobtained for five cents each, by addressing the Commissioner of Patentsetachment to the door and having superimposed sections of which the outerone has a boss for engagement with the knob hub, the said click springbeing attached to the said outer section of the knob plate, and a springon the inner knob plate part and engaging the polygonal portion of thespindle.

5. A door lock, provided with a spindle, a knob having a hub mounted toturn on the spindle, the said hub being provided with a disk havingperipheral notches, permutation devices for connecting the hub with thespindle, a knob plate secured to the door and formed of two sectionshaving a bearing for the said disk to turn in, and a click deviceattached to the said knob plate and engaging the said notched shoulder.

6. A permutation door lock, comprising a spindle, a hollow knob having ahub, a knob plate for attachment to the door, the said hub beingprovided at its inner end with a disk having peripheral notches, a clickdevice carriecl by the knob plate for engaging the said notches, aseries of tumblers within the hollow knob, one of said tumblers beingsecured to the hub and the others being loose on the hub, an arm securedon the spindle, and a spring-pressed dog pivoted on said arm and adaptedto engage the said tumblers.

In testimony whereof I have signed my name to this speciication in thepresence of two subscribing witnesses.

THOMAS HENRY HART.

Witnesses:

MAURICE J. FREEMAN, JOSEPH M. MURPHY.

Washington, D. C.

